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how to normalize microarray expression set
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12 months ago
Michel Edwar • 70
Sweden

I have downloaded a database from GEO using getGEO and then converted it into ExpressionSets using GDS2eSet. Now I am trying to normalize it using rma. It gives me error :unable to find an inherited method for function ‘probeNames’ for signature ‘"ExpressionSet". Which function I showed use to normalize the expression set ?

a1<-getGEO('GDS4758',  destdir=".")
eset<- GDS2eSet(a1, do.log2=TRUE)
eset1<-rma(eset)
GDS getGEO RMA • 1.1k views
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The platform for GDS4758 is GENE ST array. For ST array normalization 'oligo' package is used. So e.rempel's suggestion below should work. Check this webpage http://homer.ucsd.edu/homer/basicTutorial/affymetrix.html (see "Newer Affymetrix Arrays (Gene ST arrays, etc.")

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11 months ago
e.rempel • 770
Germany, Heidelberg, COS

Hi,

the error message resembles one in this thread. It looks like you should use different rma function, namely from oligo package. You could try oligo::rma instead of rma (after possible installation of oligo library)

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Indeed, for ST arrays, you should use the oligo package, not affy

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